#include "muduo/proto/codec.h" // 不带.或者..默认第一个目录是和当前工作目录同一目连下
#include "muduo/proto/dispatcher.h"
#include "muduo/base/Logging.h"
#include "muduo/base/Mutex.h"
#include "muduo/net/EventLoop.h"
#include "muduo/net/TcpServer.h"

#include "request.pb.h"
#include <iostream>
#include <functional>

class Server
{
public:
    // 重命名请求和响应的智能指针
    typedef std::shared_ptr<bit::TranslateRequest> TranslateRequestPtr;
    typedef std::shared_ptr<bit::TranslateResponse> TranslateResponsePtr;
    typedef std::shared_ptr<bit::AddRequest> AddRequestPtr;
    typedef std::shared_ptr<bit::AddResponse> AddResponsePtr;

    Server(int port)
        : _server(&_baseloop, muduo::net::InetAddress("0.0.0.0", port), "Server", muduo::net::TcpServer::kReusePort),
          _dispatcher(std::bind(&Server::onUnknownMessage, this, std::placeholders::_1,
                                std::placeholders::_2, std::placeholders::_3)),
          _codec(std::bind(&ProtobufDispatcher::onProtobufMessage, &_dispatcher,
                           std::placeholders::_1, std::placeholders::_2, std::placeholders::_3))
    {
        // 注册业务分发器请求处理函数
        _dispatcher.registerMessageCallback<bit::TranslateRequest>(std::bind(&Server::onTranslate, this,
                                                                             std::placeholders::_1,
                                                                             std::placeholders::_2,
                                                                             std::placeholders::_3));
        _dispatcher.registerMessageCallback<bit::AddRequest>(std::bind(&Server::onAdd, this,
                                                                       std::placeholders::_1, std::placeholders::_2,
                                                                       std::placeholders::_3));
        // 注册服务器消息处理回调处理函数
        _server.setMessageCallback(std::bind(&ProtobufCodec::onMessage, &_codec,
                                             std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));
                
        // 注册服务器连接建立成功回调处理函数
        _server.setConnectionCallback(std::bind(&Server::onConnection, this, std::placeholders::_1));
    }

    void start()
    {
        _server.start();
        _baseloop.loop();
    }

private:
    // 翻译业务
    std::string translate(const std::string &str)
    {
        static std::unordered_map<std::string, std::string> dict_map = {
            {"hello", "你好"},
            {"Hello", "你好"},
            {"你好", "hello"}};

        auto it = dict_map.find(str);
        if (it == dict_map.end())
        {
            return "没听懂!!!";
        }

        return it->second;
    }

    void onTranslate(const muduo::net::TcpConnectionPtr &conn, const TranslateRequestPtr &message, muduo::Timestamp)
    {
        // 1. 提取message中的有效信息 -- 需要翻译的内容
        std::string req_msg = message->msg();
        // 2. 进行翻译，得到结果
        std::string resp_msg = translate(req_msg);
        // 3. 组织protobuf的响应
        bit::TranslateResponse resp;
        resp.set_msg(resp_msg);
        // 4. 发送响应
        _codec.send(conn, resp);
    }
    void onAdd(const muduo::net::TcpConnectionPtr &conn, const AddRequestPtr &message, muduo::Timestamp)
    {
        // 1.
        int num1 = message->num1();
        int num2 = message->num2();
        // 2.
        int result = num1 + num2;
        // 3.
        bit::AddResponse resp;
        resp.set_result(result);
        // 4.
        _codec.send(conn, resp);
    }
    void onUnknownMessage(const muduo::net::TcpConnectionPtr &conn, const MessagePtr &message, muduo::Timestamp)
    {
        LOG_INFO << "onUnknownMessage: " << message->GetTypeName();
        conn->shutdown(); // 收到未知消息，停止服务
    }
    void onConnection(const muduo::net::TcpConnectionPtr &conn)
    {
        if (conn->connected())
            LOG_INFO << "新连接建立成功！";
        else
            LOG_INFO << "连接即将关闭！";
    }

private:
    muduo::net::EventLoop _baseloop;
    muduo::net::TcpServer _server;  // 服务器对象
    ProtobufDispatcher _dispatcher; // 请求分发器 -- 需要向其中注册请求处理函数
    ProtobufCodec _codec;           // protobuf协议处理器--针对收到的请求数据进行protobuf协议处理
};

int main()
{
    Server server(8085);
    server.start();
    return 0;
}
